Digital Differential Pressure Sensor SDP600

system · April 22, 2015, 5:52pm

Hello,
I have a problem with my project. I have capture the pressure difference is the DATA my sensor and I have not managed to find Arduino library for programming.
If you could tell me which library to use for my project.
Thanks you for your help,
Datasheet : http://www.farnell.com/datasheets/1720196.pdf
Sorry if i'm not very understanding but i'm not english and i have not a good english.

In french :
Bonjour,
J'ai un problème avec mon projet. Je dois pouvoir relever la différence de pression soit le DATA de mon capteur et je n'ai pas réussi à trouver de librairie ARDUINO pour programmer.
Si vous pourriez m'indiquer quel librairie utiliser pour réaliser mon projet.
Merci de votre aide,

robtillaart · April 22, 2015, 6:04pm

first thing to do is to use an I2C scanner to see if the Arduino can find the device.

they can be found here - Arduino Playground - I2cScanner -

robtillaart · April 22, 2015, 6:05pm

Note it uses 3,3V and not 5V so you might need a voltage converter!

robtillaart · April 22, 2015, 6:16pm

from the datasheet

Note that two transfer sequences are needed to perform a measurement.

First write command byte hF1 (trigger measurement) to the sensor,

and then execute a read operation to trigger the measurement and retrieve the flow or differential pressure information.

in code you need something like this

uint16_t readRawPressure(uint8_t address)
{
    Wire.beginTransmission(address);
    Wire.Write(0xF1);
    int rv = Wire.endTransmission();
    if (rv != 0)
    {
        // handle error
        return 0;
    }
    
    Wire.requestFrom(address, 2);
    uint16_t val = Wire.read() << 8;
    val += Wire.read();
    rv = Wire.endTransmission();
    if (rv != 0)
    {
        // handle error
        return 0;
    }
}

And then you need to convert the raw value to something in HPa or so

system · April 23, 2015, 2:09am

When you write Wire.requestFrom(address, 2);, what is address? The pin where data is connect to the arduino?

robtillaart · April 23, 2015, 12:56pm

The I2C address

system · April 23, 2015, 1:50pm

Yes, i understand, 0x40. and command byte hF1 (trigger measurement) to the sensor, what is that? I must find the formul to convert in Pa?
Thanks for the answer Rob

system · April 23, 2015, 1:52pm

and the function uint16_t readRawPreassure is not recognize by the ArduinoIde. What i suppose to do?

system · April 23, 2015, 2:44pm

I find this code but it doesn't work:

#include <Wire.h>

#include <Sensirion.h>

void setup()
{
  Wire.begin();

  Serial.begin(9600);
  Serial.println("\nI2C Scanner");
const int analog_pins[2] = {4, 5};       //Sensor_count = 2
                                         //Pins 4 and 5  
}


void loop()
{
  byte error, address, sensorValue, result;
  int nDevices;
  int analogOutPin;
  //int result
  
  Serial.println("Scanning...");

  nDevices = 0;
  for(address = 1; address < 127; address++ ) 
  {
    // The i2c_scanner uses the return value of
    // the Write.endTransmisstion to see if
    // a device did acknowledge to the address.
    Wire.beginTransmission(address);
    error = Wire.endTransmission();

    if (error == 0)
    {
      Serial.print("I2C device found at address 0x");
      if (address<16) 
      Serial.print("0");
      Serial.print(address,HEX);
      Serial.println("  !");

      nDevices++;
    }
    else if (error==4) 
    {
      Serial.print("Unknow error at address 0x");
      if (address<16) 
        Serial.print("0");
      Serial.println(address,HEX);
    }    
  }
  if (nDevices == 0)
    Serial.println("No I2C devices found\n");
  else
    Serial.println("done\n");

  delay(500);           // wait 5 seconds for next scan
  
  ///////////////NEW////////////////////////

int MEASUREMENT_PA_HM = 0xF1;             // update for pressure measurement, hold master
int USER_REG_W = 0xE6;                    // write user register
int USER_REG_R = 0xE7;                    // read user register
0xFE; }                                   // soft reset

float readPA(0xF1);

with the SDP6 libraries

Sensirion.cpp (4.28 KB)

Sensirion.h (2.89 KB)

robtillaart · April 23, 2015, 7:42pm

and the function uint16_t readRawPreassure is not recognize by the ArduinoIde. What i suppose to do?

try to make no typing errors

system · April 23, 2015, 8:40pm

What i suppose to do? Sorry if i make typing errors

system · April 24, 2015, 1:52am

And i make test late.. : I have Scanning...
No I2C devices found
SDA>Pin2 et SDL>Pin3

Code for the test :

#include <Wire.h>


void setup()
{
 Wire.begin();

 Serial.begin(9600);
 Serial.println("\nI2C Scanner");
}


void loop()
{
 byte error, address;
 int nDevices;

 Serial.println("Scanning...");

 nDevices = 0;
 for(address = 1; address < 127; address++ )
 {
   //address = 0x40;
   // The i2c_scanner uses the return value of
   // the Write.endTransmisstion to see if
   // a device did acknowledge to the address.
   Wire.beginTransmission(address);
   error = Wire.endTransmission();

   if (error == 0)
   {
     Serial.print("I2C device found at address 0x");
     if (address<16)
       Serial.print("0");
     Serial.print(address,HEX);
     Serial.println("  !");

     nDevices++;
   }
   else if (error==4)
   {
     Serial.print("Unknow error at address 0x");
     if (address<16)
       Serial.print("0");
     Serial.println(address,HEX);
   }    
 }
 if (nDevices == 0)
   Serial.println("No I2C devices found\n");
 else
   Serial.println("done\n");

 delay(5000);           // wait 5 seconds for next scan
}

robtillaart · April 24, 2015, 11:07am

DO you have pull up resistors?

Did you connect the SDA and SCL pins correctly?
For Arduino UNO these should be Analog4 (SDA) and analog5 (SCL)

system · April 24, 2015, 4:40pm

I have connect Sda to A4 and SDL to A5, and for one connection, i have pull up resistor for Sda and Sdl. When i test with i2c scanning, if i have sda and sdl on analog pin, the test block when it arrive to
error = Wire.endTransmission(); I have test with serial.print to see that. And i have i2c device not found if i test with the sda/sdl on pin 2 and 3.
R = 4.7k

system · April 24, 2015, 9:04pm

In the datasheet title, this is write Digital sensor, so i should be connect to other pin than analog? Like pin 3,4?

system · April 24, 2015, 10:40pm

I solve the problem for the i2c scanner, i find the sensor with 0x40 (adress) but i have the problem with the code. ;p

system · April 24, 2015, 10:51pm

Result this : Screenshot by Lightshot
With the code

#include <Wire.h>
#include <SDP6xx.h>

void setup()
{
  Wire.begin(); 
  Serial.begin(115200);
}


void loop()
{
   Serial.println((float)SDP6xx.readPA());
   delay(100);
}

system · April 24, 2015, 11:44pm

I modify the code and i have now after write the result with (pressure = sensor output / 1200) after see datasheet.
I have : Screenshot by Lightshot
It's the possibl result? Correct?

system · April 24, 2015, 11:45pm

I modify the code and i have now after write the result with (pressure = sensor output / 1200) after see datasheet.
I have : Screenshot by Lightshot
It's the possibl result? Correct?

robtillaart · April 25, 2015, 9:47am

The Arduino uses the ANALOG PINS 4 and 5 also as I2C bus. I2C is a digital protocol.

You can use other pins for I2C if you use a software I2C library. As that would make your code more complex I would not do that unless there is no other option.

Topic		Replies	Views
SDP610 with I2C connection Networking, Protocols, and Devices	3	280	October 9, 2024
Probleme with SP610 Pressure sensor Programming	12	728	June 23, 2022
Sensirion SDP610 in Educational Wind Tunnel. Sensors	2	1139	March 4, 2016
Sensirion Differential Pressure Sensor SDP600 and Arduino M0 PRO Sensors	3	3457	November 9, 2015
Library for Sensirion differential pressure sensor SDP610? Sensors	4	4125	October 14, 2013

Digital Differential Pressure Sensor SDP600

Related topics